The corrosion fatigue crack growth characteristics of small (>35pm) surface and corner cracks in aluminum alloy 7075 is established. The early stage of crack growth is studied by performing in situ long focal length microscope (500X) crack length measurements in laboratory air and 1% NaCl environments. To quantify the “small crack effect” in the corrosive environment, the corrosion fatigue crac...

Manny disc brake are produced at conventional machinery workshop. But, the optimum value of based on heat dissipation, and safety is unknown. One causes vehicle accidents factor (brake failure). Prolonged continuous braking can result in fadding. Continuous stress generation decrease fatigue life. The required material right number holes needed to solve this problem. Purpose research get temper...

In this work, the finite element simulation of dissimilar friction stir welding process is investigated. The welded materials are AA 6061-T6 and AA 7075-T6 aluminum alloys. For this purpose, a 3D coupled thermo-mechanical finite element model is developed according to the Coupled Eulerian-Lagrangian (CEL) method. The CEL method has the advantages of both Lagrangian and Eulerian approaches, whic...

The objective of this study is to quantify and understand the effectiveness of a hexavalent chrome replacement ion to inhibit environmentally assisted fatigue crack propagation (EFCP) in high strength aluminum alloys. Because of dynamic-cyclic stress (or strain) loading, fatigue degradation occurs at stress levels considerably lower than the tensile or yield strength; degradation is exacerbated...

For the aeronautics industry, constraints of mechanical strength are paramount. Aluminum and its alloys widely used for various household industrial applications. Among established identified aluminum alloys, 7075 alloy, which is an aluminum-zinc, acquires best strength. However, this sensitive to certain localized corrosion phenomena such as pitting corrosion. Pumpkin seeds (PS) were evaluated...

Sprocket merupakan salah satu bagian dari sistem transmisi yang biasa digunakan pada kendaraan bermotor. Pada eco-car tim Antawirya Universitas Diponegoro juga menggunakan sprocket sebagai komponennya. Saat memulai balapan pertama dan melakukan full throttle, menjadi gagal karena deformasi terjadi sprocket. mengalami plastis kemudian menyebabkan rantai keluar jalurnya terlepas. Tujuan kajian in...